While some train companies will not be taking part in the strike, their services are expected to be busy and passengers have been advised to allow extra time for their journey.
The TSSA is also planning to hold another round of strikes on Thursday, Friday and Saturday, while members of the Rail, Maritime and Transport Union at more than a dozen train companies and Network Rail will walk out on Saturday.
If that is not an option, the date of the ticket can be changed to travel on an alternate date or the price of it can be refunded if the train is cancelled or rescheduled.What are rail workers asking for?So far this year, several strikes have taken place across the rail sector, causing misery for passengers and frustration among workers.
Speaking to the BBC Radio 4's World at One programme, Ms Trevelyan said she met Mr Whelan and RMT general secretary Mick Lynch because she"really wanted to understand where they're coming from".
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